CN115412406B - Channel calibration method, device and processor readable storage medium - Google Patents
Channel calibration method, device and processor readable storage medium Download PDFInfo
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- CN115412406B CN115412406B CN202110587265.6A CN202110587265A CN115412406B CN 115412406 B CN115412406 B CN 115412406B CN 202110587265 A CN202110587265 A CN 202110587265A CN 115412406 B CN115412406 B CN 115412406B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/336—Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The embodiment of the application provides a channel calibration method, a device and a processor readable storage medium, wherein the method comprises the following steps: acquiring first calibration information of a transmission channel, wherein the first calibration information comprises phases of all sub-bands of the transmission channel and first channel estimation parameters of all sub-bands; determining an effective channel of each sub-band and a protection band of each sub-band according to the first channel estimation parameter of each sub-band; the phase of each sub-band is adjusted to determine the second channel estimation parameter of each sub-band; and determining frequency domain channel estimation parameters of the transmission channel according to the effective channel of each sub-band, the protection band of each sub-band and the second channel estimation parameters of each sub-band, wherein the frequency domain channel estimation parameters are used for calibrating the transmission channel. The method can improve the calibration accuracy of the transmission channel under the medium-low signal-to-noise ratio.
Description
Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to a channel calibration method, a device, and a processor readable storage medium.
Background
In the prior art, a channel array system, such as a large-scale array antenna system, is required to integrate tens of transmission channels in a small number, and tens of transmission channels in a large number, and is required to integrate tens of transmission channels in a large number, so that phase shift and amplitude between the transmission channels are required to be consistent, phase shift errors between the transmission channels are as small as possible, and therefore, calibration is required for each transmission channel. When the transmission channel calibration in the prior art is aimed at a transmission channel with no fault and a signal-to-noise ratio close to a detection threshold, for example, the signal-to-noise ratio is a medium-low signal-to-noise ratio, the residual phase difference of the edge RB (Resource Block) of the sub-band of the transmission channel is larger, so that the calibration accuracy of the transmission channel is lower, and the requirement of keeping consistent phase shift and amplitude between the transmission channels of the channel array system cannot be met.
Disclosure of Invention
The present application provides a channel calibration method, device and processor readable storage medium for solving the above technical drawbacks.
In a first aspect, a channel calibration method is provided, including:
acquiring first calibration information of a transmission channel, wherein the first calibration information comprises phases of all sub-bands of the transmission channel and first channel estimation parameters of all sub-bands;
determining an effective channel of each sub-band and a protection band of each sub-band according to the first channel estimation parameter of each sub-band;
the phase of each sub-band is adjusted to determine the second channel estimation parameter of each sub-band;
and determining frequency domain channel estimation parameters of the transmission channel according to the effective channel of each sub-band, the protection band of each sub-band and the second channel estimation parameters of each sub-band, wherein the frequency domain channel estimation parameters are used for calibrating the transmission channel.
In one embodiment, obtaining first calibration information for a transmission channel includes:
performing smooth interpolation processing on the amplitude and the phase of the transmission channel to determine first calibration information;
the first calibration information further includes an amplitude of each subband of the transmission channel; the first channel estimation parameter for each subband is determined by the amplitude of each subband and the phase of each subband.
In one embodiment, determining the effective channel for each sub-band and the guard band for each sub-band based on the first channel estimation parameter for each sub-band comprises:
and when the signal-to-noise ratio of the transmission channel is smaller than a preset signal-to-noise ratio threshold, determining an estimation index of an effective channel of each sub-band and an upper guard band and a lower guard band included by the guard band of each sub-band according to the first channel estimation parameter of each sub-band.
In one embodiment, phase adjusting the phase of each sub-band to determine a second channel estimation parameter for each sub-band includes:
for each sub-band, determining a phase difference corresponding to the phase of each sub-band;
performing phase compensation on the phase difference to obtain a compensated phase difference;
and determining a second channel estimation parameter of each sub-band according to the compensated phase difference and the estimation index of the effective channel of each sub-band.
In one embodiment, determining the frequency domain channel estimation parameters of the transmission channel based on the effective channel of each sub-band, the guard band of each sub-band, and the second channel estimation parameters of each sub-band comprises:
converting the second channel estimation parameters of each sub-band from the frequency domain to the time domain to obtain first time domain response parameters of each sub-band;
Performing time domain windowing on the first time domain response parameters of each sub-band to obtain second time domain response parameters of each sub-band;
converting the second time domain response parameter of each sub-band from the time domain to the frequency domain to obtain the frequency domain response parameter of each sub-band;
and determining the frequency domain channel estimation parameters of the transmission channel according to the frequency domain response parameters of each sub-band, the effective channel of each sub-band and the protection band of each sub-band.
In one embodiment, determining the frequency domain channel estimation parameters of the transmission channel according to the frequency domain response parameters of each sub-band, the effective channel of each sub-band and the guard band of each sub-band comprises:
removing the protective belt of each sub-band according to the frequency domain response parameters of each sub-band to obtain the sub-band of each sub-band after the protective belt is removed;
according to the effective channel of each sub-band, carrying out channel estimation on each sub-band with the guard band removed, and obtaining channel estimation parameters of each sub-band with the guard band removed;
and splicing the channel estimation parameters to determine the frequency domain channel estimation parameters of the transmission channel.
In one embodiment, after determining the frequency domain channel estimation parameters of the transmission channel according to the effective channel of each sub-band, the guard band of each sub-band, and the second channel estimation parameters of each sub-band, the method further comprises:
And determining a calibration factor of the transmission channel according to the frequency domain channel estimation parameters of the transmission channel, wherein the calibration factor is used for calibrating the transmission channel.
In a second aspect, a channel calibration device is provided, comprising a memory, a transceiver, and a processor:
a memory for storing a computer program; a transceiver for transceiving data under the control of the processor; a processor for reading the computer program in the memory and performing the following operations:
acquiring first calibration information of a transmission channel, wherein the first calibration information comprises phases of all sub-bands of the transmission channel and first channel estimation parameters of all sub-bands;
determining an effective channel of each sub-band and a protection band of each sub-band according to the first channel estimation parameter of each sub-band;
the phase of each sub-band is adjusted to determine the second channel estimation parameter of each sub-band;
and determining frequency domain channel estimation parameters of the transmission channel according to the effective channel of each sub-band, the protection band of each sub-band and the second channel estimation parameters of each sub-band, wherein the frequency domain channel estimation parameters are used for calibrating the transmission channel.
In one embodiment, obtaining first calibration information for a transmission channel includes:
Performing smooth interpolation processing on the amplitude and the phase of the transmission channel to determine first calibration information;
the first calibration information further includes an amplitude of each subband of the transmission channel; the first channel estimation parameter for each subband is determined by the amplitude of each subband and the phase of each subband.
In one embodiment, determining the effective channel for each sub-band and the guard band for each sub-band based on the first channel estimation parameter for each sub-band comprises:
and when the signal-to-noise ratio of the transmission channel is smaller than a preset signal-to-noise ratio threshold, determining an estimation index of an effective channel of each sub-band and an upper guard band and a lower guard band included by the guard band of each sub-band according to the first channel estimation parameter of each sub-band.
In one embodiment, phase adjusting the phase of each sub-band to determine a second channel estimation parameter for each sub-band includes:
for each sub-band, determining a phase difference corresponding to the phase of each sub-band;
performing phase compensation on the phase difference to obtain a compensated phase difference;
and determining a second channel estimation parameter of each sub-band according to the compensated phase difference and the estimation index of the effective channel of each sub-band.
In one embodiment, determining the frequency domain channel estimation parameters of the transmission channel based on the effective channel of each sub-band, the guard band of each sub-band, and the second channel estimation parameters of each sub-band comprises:
Converting the second channel estimation parameters of each sub-band from the frequency domain to the time domain to obtain first time domain response parameters of each sub-band;
performing time domain windowing on the first time domain response parameters of each sub-band to obtain second time domain response parameters of each sub-band;
converting the second time domain response parameter of each sub-band from the time domain to the frequency domain to obtain the frequency domain response parameter of each sub-band;
and determining the frequency domain channel estimation parameters of the transmission channel according to the frequency domain response parameters of each sub-band, the effective channel of each sub-band and the protection band of each sub-band.
In one embodiment, determining the frequency domain channel estimation parameters of the transmission channel according to the frequency domain response parameters of each sub-band, the effective channel of each sub-band and the guard band of each sub-band comprises:
removing the protective belt of each sub-band according to the frequency domain response parameters of each sub-band to obtain the sub-band of each sub-band after the protective belt is removed;
according to the effective channel of each sub-band, carrying out channel estimation on each sub-band with the guard band removed, and obtaining channel estimation parameters of each sub-band with the guard band removed;
and splicing the channel estimation parameters to determine the frequency domain channel estimation parameters of the transmission channel.
In one embodiment, after determining the frequency domain channel estimation parameters of the transmission channel according to the effective channel of each sub-band, the guard band of each sub-band, and the second channel estimation parameters of each sub-band, the method further comprises:
And determining a calibration factor of the transmission channel according to the frequency domain channel estimation parameters of the transmission channel, wherein the calibration factor is used for calibrating the transmission channel.
In a third aspect, the present application provides a channel calibration device comprising:
the first processing unit is used for acquiring first calibration information of the transmission channel, wherein the first calibration information comprises phases of all sub-bands of the transmission channel and first channel estimation parameters of all sub-bands;
a second processing unit, configured to determine an effective channel of each subband and a guard band of each subband according to the first channel estimation parameter of each subband;
a third processing unit, configured to perform phase adjustment on the phase of each subband, and determine a second channel estimation parameter of each subband;
and the fourth processing unit is used for determining frequency domain channel estimation parameters of the transmission channel according to the effective channel of each sub-band, the protection band of each sub-band and the second channel estimation parameters of each sub-band, wherein the frequency domain channel estimation parameters are used for calibrating the transmission channel.
In a fourth aspect, a processor-readable storage medium is provided, wherein the processor-readable storage medium stores a computer program for causing a processor to perform the method according to the first aspect.
The technical scheme provided by the embodiment of the application has at least the following beneficial effects:
the frequency domain channel estimation parameters of the transmission channel are determined, and are used for calibrating the transmission channel, so that the residual phase difference of the edge resource block RB is reduced under the medium-low signal-to-noise ratio, the calibration precision of the transmission channel under the medium-low signal-to-noise ratio can be improved, and particularly, the phase precision of the bandwidth edge can be improved.
Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings that are required to be used in the description of the embodiments of the present application will be briefly described below.
FIG. 1 is a schematic diagram of a system architecture provided in an embodiment of the present application;
fig. 2 is a schematic flow chart of a channel calibration method according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a subband according to embodiments of the present application;
FIG. 4 is a flow chart of another method for calibrating a channel according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a channel calibration device according to an embodiment of the present application;
Fig. 6 is a schematic structural diagram of a channel calibration device according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of illustrating the present application and are not to be construed as limiting the present application.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
In the embodiment of the application, the term "and/or" describes the association relationship of the association objects, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The term "plurality" in the embodiments of the present application means two or more, and other adjectives are similar thereto.
In order to better understand and illustrate aspects of embodiments of the present disclosure, some technical terms related to the embodiments of the present disclosure are briefly described below.
The CORDIC (Coordinate Rotation Digital Computer) algorithm, i.e. the coordinate rotation number calculation method, is mainly used for the calculation of trigonometric functions, hyperbolas, exponentials and logarithms. The algorithm replaces multiplication operation by basic addition and shift operation, so that functions such as trigonometric functions, multiplication, evolution, inverse trigonometric functions, exponentiation and the like are not needed for the rotation and orientation calculation of the vector.
The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
As shown in fig. 1, a schematic diagram of a network architecture provided in an embodiment of the present application includes: user equipment UE, such as UE110 in fig. 1, and a network node, such as network node 120 in fig. 1. The network node is deployed in an access network, for example, network node 120 is deployed in an access network NG-RAN (New Generation-Radio Access Network, new Generation radio access network) in a 5G system. The UE and the network node communicate with each other via some air interface technology, e.g. via cellular technology.
The UE according to the embodiments of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem, etc. Types of UEs include cell phones, vehicle user terminals, tablet computers, laptops, personal digital assistants, mobile internet appliances, wearable devices, and the like.
The network node to which the embodiments of the present application relate may be a base station, which may include a plurality of cells serving a UE. A base station may also be referred to as an access point, or may be a device in an access network that communicates with a UE over the air-interface, through one or more sectors, or other names, depending on the particular application. The network node may be configured to exchange received air frames with internet protocol (Internet Protocol, IP) packets as a router between the UE and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network node may also coordinate attribute management for the air interface. For example, the network node according to the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in a global system for mobile communications (Global System for Mobile communications, GSM) or code division multiple access (Code Division Multiple Access, CDMA), a network device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), a home evolved base station (Home evolved Node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), and the like. In some network structures, the network nodes may include Centralized Unit (CU) nodes and Distributed Unit (DU) nodes, which may also be geographically separated.
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In an embodiment of the present application, a channel calibration method is provided and executed by a network node, and a flow chart of the method is shown in fig. 2, where the method includes:
step S101, acquiring first calibration information of the transmission channel, where the first calibration information includes phases of sub-bands of the transmission channel and first channel estimation parameters of the sub-bands.
In one embodiment, obtaining first calibration information for a transmission channel includes:
performing smooth interpolation processing on the amplitude and the phase of the transmission channel to determine first calibration information;
the first calibration information further includes an amplitude of each subband of the transmission channel; the first channel estimation parameter for each subband is determined by the amplitude of each subband and the phase of each subband.
In one embodiment, smoothing, interpolation, etc. is performed on the amplitude and/or phase of the non-faulty transmission channel.
Step S102, according to the first channel estimation parameter of each sub-band, determining the effective channel of each sub-band and the protecting band of each sub-band.
In one embodiment, determining the effective channel for each sub-band and the guard band for each sub-band based on the first channel estimation parameter for each sub-band comprises:
And when the signal-to-noise ratio of the transmission channel is smaller than a preset signal-to-noise ratio threshold, determining an estimation index of an effective channel of each sub-band and an upper guard band and a lower guard band included by the guard band of each sub-band according to the first channel estimation parameter of each sub-band.
In one embodiment, when the signal-to-noise ratio SNR of the transmission channel is less than a preset signal-to-noise ratio threshold SNR TH Sub-band segmentation of the transmission channel is performed; when the SNR of the transmission channel is greater than or equal to the SNR TH Then a calibration factor calculation is performed, wherein SNR TH Is configurable.
In one embodiment, the sub-band segment comprises: an estimation index of an effective channel of each sub-band, and an upper guard band and a lower guard band included in the guard band of each sub-band are determined according to the first channel estimation parameter of each sub-band.
In one embodiment, the sub-bands include valid data and edge guard bands, with two adjacent sub-band data overlapping.
In one embodiment, let N be the channel estimates over the full bandwidth of a transmission channel, denoted H (N), n=1, …, N, the corresponding amplitudes a (N) =abs (H (N)), n=1, …, N, the phases Φ (N) =angle (H (N)), n=1, …, N. Wherein H (N) is a first channel estimation parameter, A (N) is the amplitude of a subband, phi (N) is the phase of the subband, and N is a positive integer.
In one embodiment, as shown in fig. 3, it is assumed that the total length of the sub-bands is l=2 m Wherein L is<N，m>0, L and m are configurable, effective length L eff =l-2*M, wherein each of the subband two-sided overlap guard bands (overlap) has M values, M>=0, m is configurable, and M, L and m are both positive integers. The estimated number of effective channels in the sub-band is (L-2*M)>0, the number of the allocatable sub-bands in the bandwidth is N sub =ceil (N/(L-2*M)), where ceil represents an upward rounding. The estimation index of the effective channel in each sub-band is shown in table 1:
table 1 estimation index of effective channel
In one embodiment, m=2, l=32 in table 1; or m=4, l=64.
Step S103, the phase of each sub-band is adjusted to determine the second channel estimation parameter of each sub-band.
In one embodiment, phase adjusting the phase of each sub-band to determine a second channel estimation parameter for each sub-band includes:
for each sub-band, determining a phase difference corresponding to the phase of each sub-band;
performing phase compensation on the phase difference to obtain a compensated phase difference;
and determining a second channel estimation parameter of each sub-band according to the compensated phase difference and the estimation index of the effective channel of each sub-band.
In one embodiment, intra-subband L is utilized eff A smoothed effective phase value phi (m), where m= 1:L-2*M, the phase difference Δphi is calculated, Δphi= (phi (1) -phi (L) eff ))/(L eff -1)。
In one embodiment, the phase adjustment is as shown in Table 2, where Δφ (m) is the compensated phase difference.
Table 2 phase adjustment
The channel estimate for one sub-band after phase adjustment is: h sub,adj (m)＝H sub (m)*e j*Δφ(m) Wherein H is sub,adj (m) is the second channel estimation parameter, H sub (m) is determined by an estimation index of an effective channel of one sub-band.
Step S104, determining frequency domain channel estimation parameters of the transmission channel according to the effective channel of each sub-band, the guard band of each sub-band and the second channel estimation parameters of each sub-band, wherein the frequency domain channel estimation parameters are used for calibrating the transmission channel.
In one embodiment, determining the frequency domain channel estimation parameters of the transmission channel based on the effective channel of each sub-band, the guard band of each sub-band, and the second channel estimation parameters of each sub-band comprises:
converting the second channel estimation parameters of each sub-band from the frequency domain to the time domain to obtain first time domain response parameters of each sub-band;
performing time domain windowing on the first time domain response parameters of each sub-band to obtain second time domain response parameters of each sub-band;
Converting the second time domain response parameter of each sub-band from the time domain to the frequency domain to obtain the frequency domain response parameter of each sub-band;
and determining the frequency domain channel estimation parameters of the transmission channel according to the frequency domain response parameters of each sub-band, the effective channel of each sub-band and the protection band of each sub-band.
In one embodiment, H is determined by IFFT (Invert Fast Fourier Transformation, inverse fast Fourier transform) sub,adj (m) converting from the frequency domain to the time domain to obtain a time domain response h sub (r)＝ifft(H sub,adj (m)); wherein h is sub (r) is a first time domain response parameter.
In one embodiment, time domain windowing includes:
and (3) calculating power: p (r) = |h (r) | 2 ，r＝1:L；
And (3) fault judgment: if P (1) < P (r), r= 2:L, reporting a subband failure;
windowing: the J paths with the strongest reserved power are J<The L, J values can be matched, e.g. 3<＝J<=l/2, the remaining weak paths are set to 0, resulting in a new time domain response h sub,new . Wherein h is sub,new Is the second time domain response parameter.
In one embodiment, h is determined by FFT (fast Fourier transform ) sub,new Converting from time domain to frequency domain to obtain frequency domain response H sub,win (m)＝fft(h sub,new (r)). Wherein H is sub,win (m) is a frequency domain response parameter.
In one embodiment, determining the frequency domain channel estimation parameters of the transmission channel according to the frequency domain response parameters of each sub-band, the effective channel of each sub-band and the guard band of each sub-band comprises:
Removing the protective belt of each sub-band according to the frequency domain response parameters of each sub-band to obtain the sub-band of each sub-band after the protective belt is removed;
according to the effective channel of each sub-band, carrying out channel estimation on each sub-band with the guard band removed, and obtaining channel estimation parameters of each sub-band with the guard band removed;
and splicing the channel estimation parameters to determine the frequency domain channel estimation parameters of the transmission channel.
In one embodiment, the phase is adjusted to H sub,win,adj (m)＝H sub,win (m)*e -j*Δφ(m) 。
In one embodiment, data stitching includes: channel estimation H for one subband sub,win,adj And (M) after removing M guard bands on two sides, selecting proper channel estimation, and splicing to obtain a frequency domain channel estimation value after noise suppression. As shown in table 3, channel estimation selection was performed.
Table 3 channel estimate selection
The channel estimation results selected by each sub-band are spliced in sequence to obtain the final channel estimation result H ic (n). Wherein n=1:n; h ic (1)、H ic (2)……H ic (N) channel estimation parameters H for the sub-bands after the guard bands are removed ic (n) is a frequency domain channel estimation parameter of one transmission channel.
In one embodiment, after determining the frequency domain channel estimation parameters of the transmission channel according to the effective channel of each sub-band, the guard band of each sub-band, and the second channel estimation parameters of each sub-band, the method further comprises:
And determining a calibration factor of the transmission channel according to the frequency domain channel estimation parameters of the transmission channel, wherein the calibration factor is used for calibrating the transmission channel.
In the embodiment of the application, the calibration precision of the transmission channel under the medium-low signal-to-noise ratio is improved, and particularly the phase precision of the bandwidth edge can be improved.
In an embodiment of the present application, another channel calibration method is provided, which is executed by a network node, and a flowchart of the method is shown in fig. 4, and the method includes:
step S201, a calibration sequence is transmitted.
In one embodiment, the calibration sequence is generated locally and transmitted within a specified time.
Step S202, transmitting the calibration sequence through a transmission network.
In one embodiment, the transmission network comprises a plurality of transmission channels that differ, such as a large-scale array antenna system, and a common calibration channel. When transmitting calibration, the calibration sequences in the transmission channels reach the common calibration channel through a combining way and reach the receiving end; when receiving calibration, the calibration sequence is sent through a common calibration channel, and the calibration sequence is shunted to each receiving channel;
step S203, calibrate signal reception.
In one embodiment, the received calibration signal is subjected to a corresponding transformation operation, such as a cyclic prefix CP removal, a time-frequency transformation, and the like.
Step S204, channel estimation.
In one embodiment, the received calibration signal is subjected to frequency domain channel estimation using a locally pre-stored calibration sequence.
Step S205, detecting whether the transmission channel has a fault, and when detecting that the transmission channel has a fault, turning to step S206 for processing; when no failure of the transmission channel is detected, the process proceeds to step S207.
In one embodiment, based on the channel estimation results, it is detected whether each channel has a fault, such as a power, phase, timing, signal to noise ratio, or the like.
Step S206, fault alarming.
In one embodiment, a channel alert is reported for a failed channel.
Step S207, smooth interpolation of the amplitude and/or phase of the transmission channel.
In one embodiment, smoothing, interpolation, etc. is performed on the amplitude and/or phase of the non-faulty transmission channel.
Step S208, when the SNR of the transmission channel is smaller than the preset SNR threshold SNR TH Then go to step S209; when the SNR of the transmission channel is greater than or equal to the SNR TH The process proceeds to step S216.
In step S209, the sub-band segment of the channel is transmitted.
In one embodiment, an estimation index of an effective channel of each sub-band and an upper guard band and a lower guard band included in a guard band of each sub-band are determined according to a first channel estimation parameter of each sub-band in a transmission channel.
Step S210, the phase of each sub-band is adjusted to determine the second channel estimation parameter of each sub-band.
Step S211, converting the second channel estimation parameter of each sub-band from the frequency domain to the time domain by IFFT, to obtain the first time domain response parameter of each sub-band.
Step S212, the first time domain response parameter of each sub-band is windowed in time domain to obtain the second time domain response parameter of each sub-band.
Step S213, converting the second time domain response parameter of each sub-band from time domain to frequency domain by FFT, to obtain the frequency domain response parameter of each sub-band.
In step S214, the phase adjustment is performed for the frequency domain response parameters of each subband.
Step S215, determining the frequency domain channel estimation parameters of the transmission channel through data splicing.
In step S216, a calibration factor is determined.
In one embodiment, a calibration factor for the transmission channel is determined based on frequency domain channel estimation parameters of the transmission channel, the calibration factor being used to calibrate the transmission channel.
In one embodiment, the phase factor is obtained by a look-up table or CORDIC or the like. And obtaining the amplitude factor of the transmission channel according to the power of each transmission channel. And obtaining a calibration factor according to the product of the phase factor and the amplitude factor.
In the embodiment of the application, under the condition of medium-low signal-to-noise ratio, for example, the signal-to-noise ratio is smaller than or equal to 20dB, the method realizes that the edge RB (Resource Block) has partial gain; with the improvement of the signal-to-noise ratio, the partial gain is gradually reduced, and the residual phase difference of the edge RBs (for example, 3 RBs on the upper edge and the lower edge) is correspondingly reduced, so that the calibration precision of the transmission channel under the medium-low signal-to-noise ratio is improved, and particularly, the phase precision of the bandwidth edge can be improved.
Based on the same inventive concept, the embodiment of the present application also provides a channel calibration device, which is applied to a network node, and the structure schematic diagram of the device is shown in fig. 5, and the transceiver 1500 is used for receiving and transmitting data under the control of the processor 1510.
Wherein in fig. 5, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 1510 and various circuits of memory represented by memory 1520, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 1500 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. The processor 1510 is responsible for managing the bus architecture and general processing, and the memory 1520 may store data used by the processor 1510 in performing operations.
The processor 1510 may be a Central Processing Unit (CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device, CPLD), or it may employ a multi-core architecture.
A processor 1510 for reading the computer program in the memory and performing the following operations:
acquiring first calibration information of a transmission channel, wherein the first calibration information comprises phases of all sub-bands of the transmission channel and first channel estimation parameters of all sub-bands;
determining an effective channel of each sub-band and a protection band of each sub-band according to the first channel estimation parameter of each sub-band;
the phase of each sub-band is adjusted to determine the second channel estimation parameter of each sub-band;
and determining frequency domain channel estimation parameters of the transmission channel according to the effective channel of each sub-band, the protection band of each sub-band and the second channel estimation parameters of each sub-band, wherein the frequency domain channel estimation parameters are used for calibrating the transmission channel.
In one embodiment, obtaining first calibration information for a transmission channel includes:
performing smooth interpolation processing on the amplitude and the phase of the transmission channel to determine first calibration information;
The first calibration information further includes an amplitude of each subband of the transmission channel; the first channel estimation parameter for each subband is determined by the amplitude of each subband and the phase of each subband.
In one embodiment, determining the effective channel for each sub-band and the guard band for each sub-band based on the first channel estimation parameter for each sub-band comprises:
and when the signal-to-noise ratio of the transmission channel is smaller than a preset signal-to-noise ratio threshold, determining an estimation index of an effective channel of each sub-band and an upper guard band and a lower guard band included by the guard band of each sub-band according to the first channel estimation parameter of each sub-band.
In one embodiment, phase adjusting the phase of each sub-band to determine a second channel estimation parameter for each sub-band includes:
for each sub-band, determining a phase difference corresponding to the phase of each sub-band;
performing phase compensation on the phase difference to obtain a compensated phase difference;
and determining a second channel estimation parameter of each sub-band according to the compensated phase difference and the estimation index of the effective channel of each sub-band.
In one embodiment, determining the frequency domain channel estimation parameters of the transmission channel based on the effective channel of each sub-band, the guard band of each sub-band, and the second channel estimation parameters of each sub-band comprises:
Converting the second channel estimation parameters of each sub-band from the frequency domain to the time domain to obtain first time domain response parameters of each sub-band;
performing time domain windowing on the first time domain response parameters of each sub-band to obtain second time domain response parameters of each sub-band;
converting the second time domain response parameter of each sub-band from the time domain to the frequency domain to obtain the frequency domain response parameter of each sub-band;
and determining the frequency domain channel estimation parameters of the transmission channel according to the frequency domain response parameters of each sub-band, the effective channel of each sub-band and the protection band of each sub-band.
In one embodiment, determining the frequency domain channel estimation parameters of the transmission channel according to the frequency domain response parameters of each sub-band, the effective channel of each sub-band and the guard band of each sub-band comprises:
removing the protective belt of each sub-band according to the frequency domain response parameters of each sub-band to obtain the sub-band of each sub-band after the protective belt is removed;
according to the effective channel of each sub-band, carrying out channel estimation on each sub-band with the guard band removed, and obtaining channel estimation parameters of each sub-band with the guard band removed;
and splicing the channel estimation parameters to determine the frequency domain channel estimation parameters of the transmission channel.
In one embodiment, after determining the frequency domain channel estimation parameters of the transmission channel according to the effective channel of each sub-band, the guard band of each sub-band, and the second channel estimation parameters of each sub-band, the method further comprises:
And determining a calibration factor of the transmission channel according to the frequency domain channel estimation parameters of the transmission channel, wherein the calibration factor is used for calibrating the transmission channel.
It should be noted that, the above device provided in the embodiment of the present invention can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in this embodiment are omitted.
Based on the same inventive concept as the previous embodiment, the embodiment of the present application further provides a channel calibration device applied to a network node, where a schematic structural diagram of the device is shown in fig. 6, and based on the channel calibration device 40, the channel calibration device includes a first processing unit 401, a second processing unit 402, a third processing unit 403, and a fourth processing unit 404.
A first processing unit 401, configured to obtain first calibration information of a transmission channel, where the first calibration information includes phases of sub-bands of the transmission channel and first channel estimation parameters of the sub-bands;
a second processing unit 402, configured to determine an effective channel of each sub-band and a guard band of each sub-band according to the first channel estimation parameter of each sub-band;
a third processing unit 403, configured to perform phase adjustment on the phase of each sub-band, and determine a second channel estimation parameter of each sub-band;
A fourth processing unit 404, configured to determine a frequency domain channel estimation parameter of the transmission channel according to the effective channel of each sub-band, the guard band of each sub-band, and the second channel estimation parameter of each sub-band, where the frequency domain channel estimation parameter is used to calibrate the transmission channel.
In one embodiment, the first processing unit 401 is specifically configured to:
performing smooth interpolation processing on the amplitude and the phase of the transmission channel to determine first calibration information;
the first calibration information further includes an amplitude of each subband of the transmission channel; the first channel estimation parameter for each subband is determined by the amplitude of each subband and the phase of each subband.
In one embodiment, the second processing unit 402 is specifically configured to:
and when the signal-to-noise ratio of the transmission channel is smaller than a preset signal-to-noise ratio threshold, determining an estimation index of an effective channel of each sub-band and an upper guard band and a lower guard band included by the guard band of each sub-band according to the first channel estimation parameter of each sub-band.
In one embodiment, the third processing unit 403 is specifically configured to:
for each sub-band, determining a phase difference corresponding to the phase of each sub-band;
performing phase compensation on the phase difference to obtain a compensated phase difference;
And determining a second channel estimation parameter of each sub-band according to the compensated phase difference and the estimation index of the effective channel of each sub-band.
In one embodiment, the fourth processing unit 404 is specifically configured to:
converting the second channel estimation parameters of each sub-band from the frequency domain to the time domain to obtain first time domain response parameters of each sub-band;
performing time domain windowing on the first time domain response parameters of each sub-band to obtain second time domain response parameters of each sub-band;
converting the second time domain response parameter of each sub-band from the time domain to the frequency domain to obtain the frequency domain response parameter of each sub-band;
and determining the frequency domain channel estimation parameters of the transmission channel according to the frequency domain response parameters of each sub-band, the effective channel of each sub-band and the protection band of each sub-band.
In one embodiment, the fourth processing unit 404 is specifically configured to:
removing the protective belt of each sub-band according to the frequency domain response parameters of each sub-band to obtain the sub-band of each sub-band after the protective belt is removed;
according to the effective channel of each sub-band, carrying out channel estimation on each sub-band with the guard band removed, and obtaining channel estimation parameters of each sub-band with the guard band removed;
and splicing the channel estimation parameters to determine the frequency domain channel estimation parameters of the transmission channel.
In one embodiment, the fourth processing unit 404 is further configured to:
and determining a calibration factor of the transmission channel according to the frequency domain channel estimation parameters of the transmission channel, wherein the calibration factor is used for calibrating the transmission channel.
It should be noted that, the above device provided in the embodiment of the present invention can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those in the method embodiment in this embodiment are omitted.
It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice. In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Based on the same inventive concept, the embodiments of the present application further provide a processor readable storage medium storing a computer program for implementing the steps of any one of the embodiments or any one of the channel calibration methods provided by any one of the alternative implementations of the embodiments of the present application when executed by a processor.
The processor-readable storage medium may be any available medium or data storage device that can be accessed by a processor including, but not limited to, magnetic memory (e.g., floppy disk, hard disk, tape, magneto-optical disk (MO), etc.), optical memory (e.g., CD, DVD, BD, HVD, etc.), and semiconductor memory (e.g., ROM, EPROM, EEPROM, nonvolatile memory (NAND FLASH), solid State Disk (SSD)), etc.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (16)
1. A method of channel calibration, comprising:
acquiring first calibration information of a transmission channel, wherein the first calibration information comprises phases of all sub-bands of the transmission channel and first channel estimation parameters of all the sub-bands;
determining an effective channel of each sub-band and a protection band of each sub-band according to the first channel estimation parameter of each sub-band;
The phase of each sub-band is adjusted to determine a second channel estimation parameter of each sub-band;
and determining frequency domain channel estimation parameters of the transmission channel according to the effective channels of the sub-bands, the protection bands of the sub-bands and the second channel estimation parameters of the sub-bands, wherein the frequency domain channel estimation parameters are used for calibrating the transmission channel.
2. The method of claim 1, wherein the obtaining the first calibration information for the transmission channel comprises:
performing smooth interpolation processing on the amplitude and the phase of the transmission channel, and determining the first calibration information;
the first calibration information further includes an amplitude of each subband of the transmission channel; the first channel estimation parameter of each sub-band is determined by the amplitude of each sub-band and the phase of each sub-band.
3. The method of claim 1, wherein said determining the effective channel for each sub-band and the guard band for each sub-band based on the first channel estimation parameter for each sub-band comprises:
and when the signal-to-noise ratio of the transmission channel is smaller than a preset signal-to-noise ratio threshold, determining an estimation index of an effective channel of each sub-band and an upper protection band and a lower protection band included by the protection band of each sub-band according to the first channel estimation parameter of each sub-band.
4. The method of claim 1, wherein said phase adjusting the phase of each of the subbands to determine a second channel estimation parameter for each of the subbands comprises:
for each sub-band, determining a phase difference corresponding to the phase of each sub-band;
performing phase compensation on the phase difference to obtain a compensated phase difference;
and determining a second channel estimation parameter of each sub-band according to the compensated phase difference and the estimation index of the effective channel of each sub-band.
5. The method of claim 1, wherein said determining frequency domain channel estimation parameters for said transmission channel based on said effective channel for each sub-band, said guard band for each sub-band, and said second channel estimation parameters for each sub-band comprises:
converting the second channel estimation parameters of each sub-band from a frequency domain to a time domain to obtain first time domain response parameters of each sub-band;
performing time domain windowing on the first time domain response parameters of each sub-band to obtain second time domain response parameters of each sub-band;
converting the second time domain response parameter of each sub-band from the time domain to the frequency domain to obtain the frequency domain response parameter of each sub-band;
And determining the frequency domain channel estimation parameters of the transmission channel according to the frequency domain response parameters of each sub-band, the effective channel of each sub-band and the protection band of each sub-band.
6. The method of claim 5, wherein said determining the frequency domain channel estimation parameters of the transmission channel based on the frequency domain response parameters of the respective sub-bands, the effective channel of the respective sub-bands, and the guard bands of the respective sub-bands comprises:
removing the protective bands of each sub-band according to the frequency domain response parameters of each sub-band to obtain the sub-band of each sub-band after the protective bands are removed;
according to the effective channel of each sub-band, carrying out channel estimation on each sub-band with the protection band removed, and obtaining channel estimation parameters of each sub-band with the protection band removed;
and splicing the channel estimation parameters to determine the frequency domain channel estimation parameters of the transmission channel.
7. The method of claim 1, further comprising, after said determining frequency domain channel estimation parameters for said transmission channel based on said effective channel for each sub-band, said guard band for each sub-band, and said second channel estimation parameters for each sub-band:
And determining a calibration factor of the transmission channel according to the frequency domain channel estimation parameters of the transmission channel, wherein the calibration factor is used for calibrating the transmission channel.
8. A channel calibration device comprising a memory, a transceiver, and a processor:
a memory for storing a computer program; a transceiver for transceiving data under control of the processor; a processor for reading the computer program in the memory and performing the following operations:
acquiring first calibration information of a transmission channel, wherein the first calibration information comprises phases of all sub-bands of the transmission channel and first channel estimation parameters of all the sub-bands;
determining an effective channel of each sub-band and a protection band of each sub-band according to the first channel estimation parameter of each sub-band;
the phase of each sub-band is adjusted to determine a second channel estimation parameter of each sub-band;
and determining frequency domain channel estimation parameters of the transmission channel according to the effective channels of the sub-bands, the protection bands of the sub-bands and the second channel estimation parameters of the sub-bands, wherein the frequency domain channel estimation parameters are used for calibrating the transmission channel.
9. The apparatus of claim 8, wherein the obtaining the first calibration information for the transmission channel comprises:
performing smooth interpolation processing on the amplitude and the phase of the transmission channel, and determining the first calibration information;
the first calibration information further includes an amplitude of each subband of the transmission channel; the first channel estimation parameter of each sub-band is determined by the amplitude of each sub-band and the phase of each sub-band.
10. The apparatus of claim 8, wherein said determining the effective channel for each sub-band and the guard band for each sub-band based on the first channel estimation parameter for each sub-band comprises:
and when the signal-to-noise ratio of the transmission channel is smaller than a preset signal-to-noise ratio threshold, determining an estimation index of an effective channel of each sub-band and an upper protection band and a lower protection band included by the protection band of each sub-band according to the first channel estimation parameter of each sub-band.
11. The apparatus of claim 8, wherein said phase adjusting the phase of each of the subbands to determine the second channel estimation parameter for each of the subbands comprises:
for each sub-band, determining a phase difference corresponding to the phase of each sub-band;
Performing phase compensation on the phase difference to obtain a compensated phase difference;
and determining a second channel estimation parameter of each sub-band according to the compensated phase difference and the estimation index of the effective channel of each sub-band.
12. The apparatus of claim 8, wherein the determining the frequency domain channel estimation parameters of the transmission channel based on the effective channel of each sub-band, the guard band of each sub-band, and the second channel estimation parameters of each sub-band comprises:
converting the second channel estimation parameters of each sub-band from a frequency domain to a time domain to obtain first time domain response parameters of each sub-band;
performing time domain windowing on the first time domain response parameters of each sub-band to obtain second time domain response parameters of each sub-band;
converting the second time domain response parameter of each sub-band from the time domain to the frequency domain to obtain the frequency domain response parameter of each sub-band;
and determining the frequency domain channel estimation parameters of the transmission channel according to the frequency domain response parameters of each sub-band, the effective channel of each sub-band and the protection band of each sub-band.
13. The apparatus of claim 12, wherein said determining the frequency domain channel estimation parameters of the transmission channel based on the frequency domain response parameters of the respective sub-bands, the effective channel of the respective sub-bands, and the guard bands of the respective sub-bands comprises:
Removing the protective bands of each sub-band according to the frequency domain response parameters of each sub-band to obtain the sub-band of each sub-band after the protective bands are removed;
according to the effective channel of each sub-band, carrying out channel estimation on each sub-band with the protection band removed, and obtaining channel estimation parameters of each sub-band with the protection band removed;
and splicing the channel estimation parameters to determine the frequency domain channel estimation parameters of the transmission channel.
14. The apparatus of claim 8, further comprising, after said determining frequency domain channel estimation parameters for said transmission channel based on said effective channel for each sub-band, said guard band for each sub-band, and said second channel estimation parameters for each sub-band:
and determining a calibration factor of the transmission channel according to the frequency domain channel estimation parameters of the transmission channel, wherein the calibration factor is used for calibrating the transmission channel.
15. A channel calibration device, comprising:
the first processing unit is used for acquiring first calibration information of a transmission channel, wherein the first calibration information comprises phases of all sub-bands of the transmission channel and first channel estimation parameters of all the sub-bands;
A second processing unit, configured to determine an effective channel of each subband and a guard band of each subband according to the first channel estimation parameter of each subband;
a third processing unit, configured to perform phase adjustment on the phase of each subband, and determine a second channel estimation parameter of each subband;
and the fourth processing unit is used for determining frequency domain channel estimation parameters of the transmission channel according to the effective channels of the sub-bands, the protection bands of the sub-bands and the second channel estimation parameters of the sub-bands, wherein the frequency domain channel estimation parameters are used for calibrating the transmission channel.
16. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing the processor to perform the method of any one of claims 1 to 7.
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| CN102158293A (en) * | 2005-01-27 | 2011-08-17 | 高通股份有限公司 | Mimo system with multiple spatial multiplexing modes |
| CN102461203A (en) * | 2009-06-09 | 2012-05-16 | 高通股份有限公司 | Systems, methods, apparatus, and computer-readable media for phase-based processing of multichannel signal |
| CN102291199A (en) * | 2010-06-18 | 2011-12-21 | 电信科学技术研究院 | Method and device for reporting channel state information |
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